Leviticus 25:45

25:45 Also you may buy slaves from the children of the foreigners who reside with you, and from their families that are with you, whom they have fathered in your land, they may become your property.

Leviticus 26:13

26:13 I am the Lord your God who brought you out from the land of Egypt, from being their slaves, and I broke the bars of your yoke and caused you to walk upright.